Ayurveda is an ancient bunch of knowledge that aims at maintaining the health of a healthy individual and curing the diseased one. This is brought by equalizing Dosha, Dhatu, and Mala. The term Kriyakala refers to recognising a disease's progress stage, which helps to determine appropriate measures to correct the imbalance in Doshas (biological factors). Ayurveda mentioned several concepts for understanding and preventing disease pathogenesis, and Shatakriyakala is one of them. It is a compound expression comprised of Kriya and Kala, where Kriya means the choice of treatment (medicine, food, and daily routine) used to improve the disturbance in Doshas, and Kala refers to the stage of progress of a disease. Shatakriyakala is mainly associated with six stages of disease progression and their possible management through Ayurveda principles. Shatakriyakala not only helps to diagnose diseases in the early stage but also helps to suppress their intensity. Kriyakala gives us the knowledge of diagnosis, prognosis, and the level of intervention to prevent disease establishment. A clear understanding of the stages of Kriyakala is an essential factor for early diagnosis and prognosis and for adopting appropriate preventing and curative measures to prevent the further establishment of disease & thereby prevent the complications associated with it emphasized in this article

Srotamsi is defined as the passages through which the various Dhatus (tissues) that are undergoing the process of metabolic transformation are transported. 1 In Ayurvedic classics, the term Srotas is used as a dynamic inner transport system of body-mind-spirit organization in addition to the circulatory system. Srotas are the channel or structure through which Sravanam karma i.e., flowing, moving, oozing and permeation of different constituents and nutrients of the body takes place. There are many numbers and types of Srotas mentioned by different Acharyas. Acharya Charaka had explained Srotas as a medicinal view while Acharya Sushrut had explained Srotas according to surgical aspect. According to Acharya Caraka, it is to be noted that Srotamsi is structurally similar to their corresponding tissues. They are of different shapes, such as circular, elongated and reticular.2 According to Acharya Susruta, those channels which originate in hollow organs, spread throughout the body, and purvey materials ‐ are to be understood as Srotamsi 3 But Pranavaha Srotas is the first & important Srotas, which carry Prana all over the body. It is related to the heart, lungs, and other structures like the pulmonary artery and pulmonary vein, which have been explained as vital air inhaled and also the vital energy of the body responsible for each and every activity of a living being. Key words: Srotas, Prana, Pranavaha srotas, Udakavaha srotas, Respiratory System

In the 21st century, everywhere people are in a hurry. Jet-powered aircraft send their human cargo across broad continents and vast oceans so that one could achieve his goal and fulfill their desire. But in a fast-paced life, the lifestyle is far from what the natural anatomy and physiology of the human body permit. Irregular and unnatural food habits, suppression of natural urges, lack of proper sleep, etc. are the inseparable parts of daily routine that enervate the body arising in times of crisis. According to Ayurveda Swasthya (health) does not only mean physical fitness but mental fitness as well. Ahara, Nidra, and Brahmacharya are three sub pillars that support the main pillar, the body itself. Ayurveda very frankly gives potential stress on Food, Sleep, and Abstinence to be used Uktivat (planned manner). This facilitates a person with benefits of life endowed with strength, complexion, and full life span, provided He / She does not indulge in Ahita Ahara and Vihar and maintains rules prescribed for that. "Sleep is the golden chain that ties health and our body together" Sleep is a way to nourish our body, mind, and spirit. It is an important component of good health and peace of mind. Getting sound sleep each night imparts physical and mental balance to prepare our body and mind for the next day. Ayurveda views restful sleep as important as diet and also an essential pillar of good health. Sleep is nothing but a temporary loss of contact with Gyanendriya and Karmendriya Nidra plays a decisive role in the development, sustenance, reproduction, and termination of life. Most of the diseases are mainly due to improper Nidra. None of the existing systems of medicine is the complete answer for all health.

The world was confronted with an illness 'COVID-19', caused by the novel coronavirus SARS-CoV-2. This novel coronavirus is highly contagious and in just a few months has become a serious threat to human health all over the world. It was declared as a Public Health Emergency of International Concern by the end of January 2020 and a pandemic in March 2020. In addition to the public health challenges, this pandemic has created another parallel pandemic of mental health problems. There are many relations of doing panic and getting the disease and the pos- sibility of Mansik Bhavas like fear (Bhaya), anger (Krodha), grief (Shoka) and not follow Sadvrutta can be the cause or precipitating factor of infection to any person. Ayurveda and modern point of view agree to the statement that different Mansik Bhavas like Bhaya, Krodha, Shoka and not follow Sadvrutta etc. can lead to or can act as Hetu for many diseases like COVID-19 etc. and hence there is the existence of a relation between these Mansik Bhavas and Vyadhi Utpatti. Furthermore, the existing mental health problems have also been seen to exacerbate owing to this pandemic. The mental health problems are both seen among the community members and the healthcare pro- viders who are at the continuous forefront of service provision in healthcare settings. The best way of preventing COVID-19 infection is by enhancing an individual's body immunity. Some of the principles could be useful in mitigating the mental health issues that the current world is grappling with owing to COVID‐19. In this review article, we will understand the Role of Mansik Bhavas on immunity to COVID-19 with different references given in Ayurvedic texts, modern texts and articles. Keywords: Ayurveda, COVID-19, Mansik bhavas (Bhaya, Krodha, Shoka and Sadvrutta), Immunity.

The world was confronted with an illness 'COVID-19', caused by the novel coronavirus SARS-CoV-2. This novel coronavirus is highly contagious and in just a few months has become a serious threat to human health all over the world. It was declared as a Public Health Emergency of International Concern by the end of January 2020 and a pandemic in March 2020. In addition to the public health challenges, this pandemic has created another parallel pandemic of mental health problems. There are many relations of doing panic and getting the disease and the pos- sibility of Mansik Bhavas like fear (Bhaya), anger (Krodha), grief (Shoka) and not follow Sadvrutta can be the cause or precipitating factor of infection to any person. Ayurveda and modern point of view agree to the statement that different Mansik Bhavas like Bhaya, Krodha, Shoka and not follow Sadvrutta etc. can lead to or can act as Hetu for many diseases like COVID-19 etc. and hence there is the existence of a relation between these Mansik Bhavas and Vyadhi Utpatti. Furthermore, the existing mental health problems have also been seen to exacerbate owing to this pandemic. The mental health problems are both seen among the community members and the healthcare pro- viders who are at the continuous forefront of service provision in healthcare settings. The best way of preventing COVID-19 infection is by enhancing an individual's body immunity. Some of the principles could be useful in mitigating the mental health issues that the current world is grappling with owing to COVID‐19. In this review article, we will understand the Role of Mansik Bhavas on immunity to COVID-19 with different references given in Ayurvedic texts, modern texts and articles. Keywords: Ayurveda, COVID-19, Mansik bhavas (Bhaya, Krodha, Shoka and Sadvrutta), Immunity.